We're draining our 30,000 gal pool due to a leak that, in years past, was always the hydrostatic valve. After draining it today, I'm seeing trails of water along the edge where the "tile" meets the gunite. IS this a common place for a leak? We've had this pool for almost 30 years and never had a problem there. I'm just wondering if it looks like that because my wife as cleaning that area with some bleach, a broom, and the hose. I'm hoping I don't have to caulk that whole area. I'm getting too old for this "Stuff".